F Invsee
By
balustrada — Inspect a player's inventory/armour/off-hand and ender chest with a custom gui / Finvsee
BetterGUI
By
HSGamer — An animated menu, a simple menu-designing tool, or just a better GUI plugin
SCore
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Sykuu — A simple, essential command & feature plugin
CommandDoesNotExist
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TeamVK — Configurable Command Blocker! Hide your plugin, block any commands and command args of your choice!
Item2Chat
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TeamVK — Show off what you've got! (items in your hand or your inventory!)
XItemsRemover
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Xezard — A simple plugin that automatically removes dropped items with a timer displayed on them.